PCI-中断机制分析

PCI1,21(11,730000;21,810008):PCI,PCI,IRQi,CPU,CPU,,1:PCI;;:TP336:A:1001-7542(2005)02-0051-03PCI(PeripheralComponentInterconnect,)Intel,,1PCI32/64,,132MB/s(32)1PCI,PCI,(POST-PowerOnSelfTest)PCI,,,I/01PCI,11PCI1:PCIINTA#-INTD#4,IN2TA#,,PCIINTA#-INTD#1(3CH)(3BH)118,PCI(INTA#-INTD#)1INTA#,1;INTB#:2004-12-10:(1969-),(),,,120052()JournalofQinghaiNormalUniversity(NaturalScience)2005No.2©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,2;INTC#,3;INTD#,4;,0,5FFH1X86PC,INTA#-INTD#8259AIRQ0-IRQ151618,POSTCode,1PCI,(INTA#-INTD#)(1RQO-IRQ15)1,,,01516IRQ,255,162541:INTA#IRQ3,31(PIC:Programmableinterruptcontroller)18259A8259A,,1111PCI/ISA(),INTA#,INTB#,INTC#,INTD#,IRQi1INTX#IRQi,1,IRQW,IRQX,IRQY,IRQZ,IRQ11:MB=IRQ(IRQW:0,IRQX:1,IRQY:2,IRQZ:3)D=I=INTX#(INTA#:0,INTB#:1,INTC#:2,INTD#:3)MB=(D+1)MOD432:0,4,8,12,16,20,24,28:INTA#IRQWINTB#IRQXINTC#IRQYINTD#IRQZ1,5,9,13,17,21,25,29:INTA#IRQXINTB#IRQYINTC#IRQZINTD#IRQW2,6,10,14,18,22,26,30:INTA#IRQYINTB#IRQZINTC#IRQWINTD#IRQX3,7,11,15,19,23,27,31:INTA#IRQZINTB#IRQWINTC#IRQXINTD#IRQY,1:0INTA#,2INTC#IRQW1INTA#IRQX2INTA#,1INTB#IRQY3INTA#,2INTB#IRQZ2PCIPCI,CPU,CPU,,PCICPU,PCI,PCIFRAME,C/BE0000,IRDYTRDY,8259APCIA/D1CPU,125()2005©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.3PCI,,WINDOWS1PCI1,,0INTA#2NTC#IRQW1,IRQW,1?,,IRQi,,,1,,0INTA#,0IRQW,2INTC#IRQW,2INTC#IRQW,OINTA#2INTC#,1IRQ,CPU,,1,,,,,,1PCIISA,1,ISA,PCI,:PCI,ISA1,PCI,,1,1,1:[1]PCISpecialInterestGroup.PCILocalBusSpecification,Revision213,[S].[2]PCISpecialInterestGroup.PCItoPCIBridgeArchitectuerSpecification,Revision1.0,[S].[3]1PCI[M].:,1998.[4],.[M].:,1998.[5][]DouglasV1HALL,.()[M].:,1994.AnalysisofPCIinterruptmechanismsystemMAYu2ying1,2,MAYi2de1(1.Schoolofinformationscience&engineering,LanzhouUniversity,Lanzhou730000,China;2.Departmentofcomputer,QinghaiNormalUniversity,Xining810008,China)Abstract:PCIbushasfourinterruptlines.AllPCIdevicesusetheseinterruptlinestorequestaninterruptto2gether.InterruptsareroutedtoIRQipinsofprogrammableinterruptcontrollerviaprogrammableinterruptrouterandpropagatedtoCPUbyprogrammableinterruptcontroller.AfterCPUrespondtointerrupt,itobtainentryaddressfrominterruptertryaddresstableorentryaddresslinktogotoperforminterruptserveprogram.Keywords:PCLinterrupt;hardwarecomposing;route352,:PCI©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.